.black {
	background: black;
	color: white;
	font: 20px;
	width: 100px;
	height: 50px;
}

.white {
	background: white;
	color: black;
	font: 20px;
	width: 50px;
	height: 100px;
}

.box {
	width: 400px;
	height: 400px;
	font: black;
	border: 1px grey solid;
	margin: 10px;
	padding: 20px;
	/* float:left; */
}

nav {
	margin: 5px;
}

footer {
	margin: 5px;
}